Drawing-board.



No. 673,20l. Patented Apr. 30,:190l.

R. ENG ELMANN DRAWING BOARD.

(Application ma Sept. 11, 1900.

(No Modeifl 72 km A INVENTOI? A new;

. UNITnn TATES PATENT FFICE.

RUDOLF ENGELMANN, OF NEW YORK, N. Y.

DRAWING-BOARD.

SPECIFICATION forming part of Letters Patent No. 673,201, dated April 30, 1901.

Application filed September 11, 1900. Serial No. 29,644. (No model.)

To all whom it may concern:

Be it known that I, RUDOLF ENGELMANN, a subject of the Emperor of Germany, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Drawing-Board, of which the following is a full, clear, and exact description.

One purpose of this invention is to'construct a drawing-board of metal and to provide means whereby one or more sheets of paper or other material may be held at the corners on the board and so stretched that the portion of material drawn upon will be without wrinkles and will lie close to the working face of the board.

Another purpose of the invention is to provide means for expeditiously and conveniently adjusting the fastening devices for the sheets of paper and also to provide means whereby when the locking devices have been adjusted they will be held as adjusted.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forminga part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan View of the improved drawing-board. Fig. 2 is a longitudinal section taken practically on the line 2 2 of Fig. 1. Fig. 3 is an enlarged plan view of one corner of the board, illustrating the application thereto of the fastening devices for the sheets to be placed on the board. Fig. 4 is a section taken practically on the line 4 4 of Fig. 3. Fig. 5 is a view similar to Fig. 3, showing a slight departure in the construction of the fastening devices for the sheets. Fig. 6 is a section taken substantially on the line 6 6 of Fig. 5. Fig. 7 is a fragmentary plan showing a modification, and Fig. 8 is a section through the line 8 8 of Fig. 7.

A represents the body of the drawing-board, which body is constructed of metal, aluminium being preferred because of its lightness; but any other metal may be used. This board A is provided with a marginal flange 10 and is strengthened by longitudinal and transverse webs 11 and 12, as shown in Figs. 1 and 2. The marginal flange 10 is thickened transversely at its upper portion or where it connects with the board, so that an upper projecting marginal surface 13 is obtained, which surface is made true in any approved manner, as it afiords a bearing for the head of a T-square. The remaining portion of the flange 10 may remain in the condition in which it left the mold.

' The board A is provided at each corner with a diagonal opening a, and these openings extend through the outer edges of the board, as shown in Figs. 1, 3, and 5. In each of said openings at a frame 14 is located, and this frame is attached to the under face of the board A through the medium of flanges 15, attached to the marginal portions of the frame or to lugs similarly located, through which lugs or flanges suitable bolts or screws 16 are passed. Rollers or shafts 17 are journaled longitudinally in the frame 14, one or a number of rollers or shafts being placed in each frame, and the trunnions at the outer ends of these rollers or shafts extend beyond the outer end of the frame in which the shafts are mounted, as is also shown in Figs. 3 and 5. Each outer trunnion is preferably provided with a polygonal outer extremity 19, whereby the rollers or shafts may be turned by a key 20, and usually and preferably the outer trunnions of the rollers or shafts in each of the frames 14 are graduated in length. Each roller or shaft 17 is provided with a longitudinal slot 18, adapted to receive a corner of the sheet B, which is to be stretched and secured upon the working face of the board A, as shown in Fig. 1. It will be observed that by this construction of a fastening device a number of sheets may be held and stretched upon the board, one over the other, if desired.

In order to prevent the rollers or shafts 17 from moving after adjustment, I employ brake-shoes 22, located in vertical slots 21, produced in an end portion of a frame 14, as shown in Fig.4. The roller-shafts pass through the same slots 21, and the said brake-shoes are held in frictional engagement with the trunnions of the rollers or shafts 17 by means of screws 23, located in the frame 14 and eX- tending into the slots of the frame, as is also shown in Fig. 4; but other forms of locking devices may be employed in connection with the rollers.

In Figs.3 and4 I have illustrated the frames 14 as permanently secured to the drawingboard; but in Figs. 5 and 6 I have illustrated frames 14, which are mounted to slide in the openings (1 in the drawing-board, the frames 142 having ribs at their side portions, which travel on guide-bars secured to the under face of the frame 14* at the opening a. In Fig. 5 I have also illustrated a slight change in the form of a frame carrying the roller 17, the end portions of the frame let being stepped, so that the rollers or shafts 17 are graduated in length.

I desire it to be understood that the drawing-board may be constructed with a metallic frame or boxing 28 and an upper surface or filling 29'of wood; but the roller or shaft fastening device will be placed as described. Such a construction of board will enable thumb-tacks to be used, if found desirable.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. As an improved article of manufacture, a metallic drawing board having rollers placed diagonally at its corners, which rollers are adapted to receive and to hold the corners of a sheet carried by the board.

2. A drawing-board provided with a series of rollers or shafts journaled diagonally at its'corners, each roller or shaft being provided With a longitudinal slot, the trunnions of the rollers 'or shafts being adapted to re- .ceive a key, for the purpose set forth.

3 A metallic drawing-board,provided with rollers or shafts mounted to revolve at the corners of the board, the rollers or shafts having longitudinal slots produced therein, and locking devices for the said rollers, as and for the purpose set forth.

4. A metallic drawing-board, frames located diagonally at the corners of the said board, rollers or shafts journaled in the said frames, provided with means for attachment to the corners of a sheet of material to be stretched on the board, a trunnion of the said shafts or rollers being adapted to receive a key, and locking devices movable in the said frames and arranged for engagement with the trunnions of said rollers or shafts, as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

RUDOLF ENGELMANN.

Witnesses:

JNo. M. BITTER, J. W. WANAFORD. 

